I found a file that stores everything on you hdd, is in /dev_hdd0/mms/db/metadata_db_hdd
Open it in ftp download and open it in a hex editor and have a look.
Its near the bottom it has every game and app listed in it except multiman...
I dony know if sony can see this file or not, i deleted it and it rebuilds when you restart with all the aps listed and deleting the app from the list makes it not work properly.
So as much as i hate to say it since my app wipes them, i dont think wiping out or replacing the .dat files is gonna help.